title: Speckle noise suppression in digital holography by angular diversity with phase-only spatial light modulator.
abstract: A speckle noise suppression method in digital holography is proposed by the angular diversity with a phase-only spatial light modulator (SLM). The minimal angular difference of illumination beams is quantitatively analyzed to ensure the noncorrelation of any two speckle patterns, and then the phase-only SLM is employed to generate a series of tilted illumination beams. Comparing with the typical methods, the tilted illumination beams are controlled dynamically and accurately, which makes it possible to record a large number of holograms. Finally, using an image-plane digital holographic system, 117 holograms are recorded respectively, and the synthesized reconstructed images are obtained with the greatly suppressed speckle noise which is in good agreement with the theoretical results. The experimental results demonstrate the effectiveness, repeatability, and practicability of the proposed approach.
authors.forename: Yunxin
authors.initials: Y
authors.lastname: Wang
authors.forename: Puhui
authors.initials: P
authors.lastname: Meng
authors.forename: Dayong
authors.initials: D
authors.lastname: Wang
authors.forename: Lu
authors.initials: L
authors.lastname: Rong
authors.forename: Spozmai
authors.initials: S
authors.lastname: Panezai